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Help => Graphics => Topic started by: BaneTrapper on September 02, 2013, 06:16:49 pm

Title: If object position is out of vissible screen, is it drawn?
Post by: BaneTrapper on September 02, 2013, 06:16:49 pm

Hello.
If an rectangle with (X=0 Y=0 W=10 H=10) is drawn to a window that its position and size is
(X=100, Y=100, W=600, H=400)
Will the object be drawn and use cpu? or is it gonna check if it is in visible screen and not draw it.

Title: Re: If object position is out of vissible screen, is it drawn?
Post by: Laurent on September 02, 2013, 06:19:57 pm

It will use as much CPU as any other entity, and a little GPU. So if you can easily discard non-visible entities yourself (and your performances need it), then it's a good thing to do.

Title: Re: If object position is out of vissible screen, is it drawn?
Post by: BaneTrapper on September 02, 2013, 06:36:56 pm

Thank you on lightning fast respond  :).
I am just asking that because i drawn 100*100*4+5000*4 vertices that are textures and still getting 600-1200 fps with additional logic thrown in that mix and i am very surprised on that performace.
And most of them go out of screen so i was just wondering.

Title: Re: If object position is out of vissible screen, is it drawn?
Post by: Ancurio on September 03, 2013, 05:52:29 pm

Modern GPUs have optimized codepaths/hardware for culling invisible objects. However, if you pre-cull on CPU side, you'll save yourself the (probably small) bandwidth overhead of sending the vertex data to the GPU every frame.